Low temperatures when drying ensures safety.
The low drying temperatures helps prevent dust explosions. Dust explosions can occur when a combustible material that have access to oxygen is found in a dust cloud. When the materials particles are small a big area of the material can react with the air. The results, at an ignition, is a very fast combustion rate that results in an explosion. The ignition can come from a spark, when the materials combustion temperature is reached or by friction as the particles move against eachother. Many materials can cause dust explosions, such as cereal, synthetic materials like pastics to coal and metals (https://www.elsevier.com/books/dust-explosions-in-the-process-industries/eckhoff/978-0-7506-7602-1).